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1 Microbial Ecology and Biotechnology, Department of Plant and Environmental Sciences, Faculty of Science, Københavns Universitet 2 Chinese Academy of Sciences 3 Nanjing Normal University 4 Department of Agriculture & Ecology, Genetics & Microbiology, Department of Agriculture & Ecology, Faculty of Life Sciences, Københavns Universitet 5 Nanjing Normal University 6 Department of Agriculture & Ecology, Genetics & Microbiology, Department of Agriculture & Ecology, Faculty of Life Sciences, Københavns Universitet
Soils in urban areas are subjected to compaction with accelerating urbanization. The effects of anthropogenic compaction on urban soil denitrification are largely unknown. We conducted a study on an urban park soil to investigate how compaction impacts denitrification. By using 15N labeling method and acetylene inhibition technique, we performed three coherent incubation experiments to quantify denitrification in compacted soil under both aerobic and anaerobic conditions. Uncompacted soil was set as the control treatment. When monitoring soil incubation without extra substrate, higher nitrous oxide (N2O) flux and denitrification enzyme activity were observed in the compacted soil than in the uncompacted soil. In aerobic incubation with the addition of K15NO3, N2O production in the compacted soil reached 10.11 ng N h-1 g-1 as compared to 0.02 ng N h-1 g-1 in the uncompacted soil. Denitrification contributed 96 % of the emitted N2O in the compacted soil and 36 % of the emitted N2O in the uncompacted soil; total denitrification rate was higher in the compacted soil (up to 79.35 ng N h-1 g-1) than in the uncompacted soil (0.11 ng N h-1 g-1). Under anaerobic incubation with the addition of K15NO3, no statistical difference in total N losses and 15N-(N2O+N2) flux between the uncompacted soil and the compacted soil was detected. Compaction promoted soil denitrification and may impact urban N biogeochemical cycling. © 2013 Springer-Verlag Berlin Heidelberg.
Environmental Science and Pollution Research, 2014, Vol 21, Issue 5, p. 3783-3791
Compaction; Denitrification; Nitrous oxide; Urban soil
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